Write logic for createElection validation

internal/validator/validator.go

@@ -0,0 +1,65 @@
+package validator
+
+import (
+	"regexp"
+	"slices"
+	"strings"
+	"time"
+	"unicode/utf8"
+)
+
+type Validator struct {
+	NonFieldErrors []string
+	FieldErrors    map[string]string
+}
+
+func (v *Validator) Valid() bool {
+	return len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0
+}
+
+func (v *Validator) AddNonFieldError(message string) {
+	v.NonFieldErrors = append(v.NonFieldErrors, message)
+}
+
+func (v *Validator) AddFieldError(key, message string) {
+	if v.FieldErrors == nil {
+		v.FieldErrors = make(map[string]string)
+	}
+	if _, exists := v.FieldErrors[key]; !exists {
+		v.FieldErrors[key] = message
+	}
+}
+
+func (v *Validator) CheckField(ok bool, key, message string) {
+	if !ok {
+		v.AddFieldError(key, message)
+	}
+}
+
+func NotBlank(value string) bool {
+	return strings.TrimSpace(value) != ""
+}
+
+func MinChars(value string, n int) bool {
+	return utf8.RuneCountInString(value) >= n
+}
+
+func MaxChars(value string, n int) bool {
+	return utf8.RuneCountInString(value) <= n
+}
+
+func PermittedValue[T comparable](value T, permittedValues ...T) bool {
+	return slices.Contains(permittedValues, value)
+}
+
+func Matches(value string, rx *regexp.Regexp) bool {
+	return rx.MatchString(value)
+}
+
+func GreaterThan(value int, n int) bool {
+	return value > n
+}
+
+func After(value time.Time, n time.Time) bool {
+	return value.After(n)
+}